There's other ways to drift, but here's how I drift:

One way I drift is powersliding. I slow down a bit before oversteering in a corner. If the car isn't going that fast, I just ignore braking. Then I turn the wheel the other way while stepping on the gas. Normally this leaves me in a guardrail or on the other side of the corner if I'm lucky.

Another way I drift is by pulling the handbrake. However, sometimes I spin out and endanger the life of a guardrail. Or fall off a cliff. Or end up in a cliff.

These two videos show more drifting methods.

BeamNG.drive | 25 Different Drifts: https://www.youtube.com/watch?v=RnsnSi2-PDo
BeamNG.drive | 25 MORE Different Drifts: https://www.youtube.com/watch?v=YaiUoJzG0II